Yes they are very well educated
Answer:
20% of worlds population survive on 1 dollar a day
Levees and embankments allow humans to c)settle below river level. A levee is defined as "an elongated naturally occurring ridge or artificially constructed fill or wall, which regulates water levels." This definition can also be used for the term embankment.
To be frank, I don't think your question is specific enough, but I would say that the answer would be the Rocky mountains, or just mountains. those are the only major kinds of landforms I can think of
